Parabolic Gradient

parabolic_gradient.py

def parabolic_crease(spacing, c, scale=100, corner=1, resolution = 1000):
  """
  Parameters:

  spacing  = controls how close the intermediate values will be to lower value
  c        = higher the c more spread out the gradient will be
  scale    = lesser the scale more concentrated is gradient towards the corner
  """
  img = np.zeros((resolution, resolution))

  # Varying the scale parameter of create_uneven_array will give the parabolic gradient transition
  for i in range(resolution):
    img[i] = create_uneven_array(255, 0, resolution, spacing + c*i/scale)

  if corner == 1:
    return img
  elif corner == 2:
    return img[::-1]
  elif corner == 3:
    return img.T
  else:
    return img.T[::-1]

# If cross=1, then cross crease else linear crease is returned
def cross_crease(spacing, cross=1, resolution = 1000):
  a = create_uneven_array(255, 0, resolution, spacing, cross=True) 
  img = np.tile(a, (resolution, 1))
  return normalize_img(img*img.T) if cross else img